---
name: "pcfrtc"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/pcfrtc"
---

# pcfrtc(4)

NXP PCF8523 real-time clock

## NAME

**pcfrtc** – NXP PCF8523 real-time clock

## SYNOPSIS

**pcfrtc\* at iic? addr 0x68**

## DESCRIPTION

The **pcfrtc** driver provides support for the NXP PCF8523 real-time clock chip.

## SEE ALSO

[iic(4)](/iic/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **pcfrtc** driver first appeared in OpenBSD 6.0.

## AUTHORS

The **pcfrtc** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.